.pinpoint {
    /*  */
    content: " ";
    display: block;

    /* box */
    width: 2px;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 7px solid #fff;

    
    /* position */
    position: absolute;
    top: 37px;
    left: 0;
    right: 0;
    margin: auto;
}